# Inventory Management System: Class Design## OverviewThis guide outlines how to implement an inventory management system by creating a Python file named `inventory.py`. This program will manage a collection of inventory items using a class named `Inventory` with several key functionalities. ## Class Definition: `Inventory`### Initialization- **Function: `__init__`** - **Parameters:** - `self`: The instance of the class. - `filename`: A string representing the name of the JSON file. - **Actions:** - Define `self.data` as an instance variable to store the inventory dictionary. - Load data from the JSON file, if available, and assign it to `self.data`. - If the file doesn't exist or there's an error, handle it gracefully.### Adding Items- **Function: `add_item`** - **Parameters:** - `self`: The class instance. - `barcode`: A string used as a key in the dictionary. - `description`: A brief description of the item. - **Actions:** - Check the format of `barcode`; return 109 if the format is incorrect. - Return 101 if the `barcode` already exists. - Add the item to the dictionary with a quantity of zero. - Save the updated dictionary to the JSON file. - Return 100 for a successful addition.### Modifying Item Descriptions- **Function: `modify_description`** - **Parameters:** - `self`: The class instance. - `barcode`: The item's barcode. - `description`: The new description for the item. - **Actions:** - Return 102 if the `barcode` is not found. - Update the item's description. - Save the changes to the JSON file. - Return 100 for a successful update.### Adding Quantity- **Function: `add_qty`** - **Parameters:** - `self`: The class instance. - `barcode`: The item's barcode. - `qty`: The quantity to add. - **Actions:** - Return 102 if the `barcode` doesn't exist. - Validate the `qty`; return 108 if invalid. - Update the quantity and save changes. - Return 100 for a successful addition.### Removing Quantity- **Function: `remove_qty`

Python which it is a high-level, general-purpose programming language. Its also design which also…

a. Define a class named Inventory. a. Define a member function named_init_ to meet the following requirements: a. Take a self object as a positional parameter. b. Take a filename string as a keyword parameter. c. Define a self.data instance variable to hold the dictionary. d. Open the filename JSON file, if it exists and contains data, assign the JSON deserialized data (a dictionary) to self.data, otherwise cleanly handle the error.

a. Define a class named Inventory. a. Define a member function named_init_ to meet the following requirements: a. Take a self object as a positional parameter. b. Take a filename string as a keyword parameter. c. Define a self.data instance variable to hold the dictionary. d. Open the filename JSON file, if it exists and contains data, assign the JSON deserialized data (a dictionary) to self.data, otherwise cleanly handle the error.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

# Inventory Management System: Class Design

## Overview

This guide outlines how to implement an inventory management system by creating a Python file named `inventory.py`. This program will manage a collection of inventory items using a class named `Inventory` with several key functionalities.

## Class Definition: `Inventory`

### Initialization

- **Function: `__init__`**
- **Parameters:**
- `self`: The instance of the class.
- `filename`: A string representing the name of the JSON file.
- **Actions:**
- Define `self.data` as an instance variable to store the inventory dictionary.
- Load data from the JSON file, if available, and assign it to `self.data`.
- If the file doesn't exist or there's an error, handle it gracefully.

### Adding Items

- **Function: `add_item`**
- **Parameters:**
- `self`: The class instance.
- `barcode`: A string used as a key in the dictionary.
- `description`: A brief description of the item.
- **Actions:**
- Check the format of `barcode`; return 109 if the format is incorrect.
- Return 101 if the `barcode` already exists.
- Add the item to the dictionary with a quantity of zero.
- Save the updated dictionary to the JSON file.
- Return 100 for a successful addition.

### Modifying Item Descriptions

- **Function: `modify_description`**
- **Parameters:**
- `self`: The class instance.
- `barcode`: The item's barcode.
- `description`: The new description for the item.
- **Actions:**
- Return 102 if the `barcode` is not found.
- Update the item's description.
- Save the changes to the JSON file.
- Return 100 for a successful update.

### Adding Quantity

- **Function: `add_qty`**
- **Parameters:**
- `self`: The class instance.
- `barcode`: The item's barcode.
- `qty`: The quantity to add.
- **Actions:**
- Return 102 if the `barcode` doesn't exist.
- Validate the `qty`; return 108 if invalid.
- Update the quantity and save changes.
- Return 100 for a successful addition.

### Removing Quantity

- **Function: `remove_qty`

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